rconftool is a reimplementation of Sam Varshavchik's sysconftool in Ruby. See http://www.courier-mta.org/sysconftool/ for details of the original. Its purpose is to keep configuration files "fresh" when upgrading an application from one version to another, ensuring that all necessary settings are present and obsolete ones removed.

rconftool can be called as a library function or from the command line. It can also install groups of files recursively from one directory tree into another.